Fix: Modifying a standalone audit when using the dev-only virtual environment mode

[izeigerman]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes an issue where modifying a standalone audit in dev-only virtual environment mode would fail. The fix ensures proper handling of snapshot comparisons between models and non-models (like audits) by adding appropriate type checks before evaluating virtual environment mode changes.

• Adds early type validation to prevent virtual environment mode comparisons on non-models
• Includes a comprehensive test case that reproduces and validates the fix for standalone audit modifications

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
sqlmesh/core/plan/common.py	Adds type checking logic to handle model vs non-model snapshot comparisons
tests/core/test_integration.py	Adds test case verifying standalone audit modification works correctly

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